Public Ok Rummy pages do not publish a formal spec sheet, so the most useful system guide is a practical one.

Performance problems usually show up on low-storage phones, heavily customized Android builds, or devices switching between weak data networks during login or wallet actions.
The install step is only half the job. The first launch tells you whether the app, wallet, and help route behave the way the page promised.
On Ok Rummy, the safer order is still the same: finish the APK download, confirm the install permission request, open the app, then inspect the first cash rummy rooms area and the wallet view before you do anything else.
The current reference point for this app is version v5.3.0, a file around 43 MB, and a device running Android 6.0+. Those details should line up with the download page before you continue.
If the landing screen, wallet wording, or help route feels different from what you expected, stop there and compare it against this guide before you try again.
This page leans especially on cash-table checks before the first hand because table minimums, wallet fit, rule visibility, and the checks that matter before entering a real-money rummy table.
Move into the bonus and payment pages once the app is installed correctly.